Methods and Objects Employing Machine Readable Data

1. A method to help determine whether an object is legitimate, comprising using a handheld device equipped with visible light sensing capability to capture image data corresponding to a utilitarian object, said object having utility other than serving to convey or represent information; analyzing the captured visible light image data to decode digital watermark information steganographically encoded therein; and using the decoded information in a determination of whether the object is legitimate.

2. The method of claim 1 that includes capturing the image data from an integrated circuit.

3. The method of claim 2 in which the image data corresponds to a texture pattern with which the integrated circuit was marked, wherein such marking does not alert a viewer that the integrated circuit conveys digital information.

4. A method to help determine whether an object is legitimate, comprising: using a handheld device equipped with an optical sensing capability to capture image data corresponding to a utilitarian object, said object having utility other than serving to convey or represent information; analyzing the captured image data to decode digital watermark information steganographically encoded therein; and using the decoded information in a determination of whether the object is legitimate; wherein said capturing includes capturing the image data from a mechanical bolt.

5. The method of claim 4 in which the image data corresponds to a texture pattern with which the bolt was marked, wherein such marking does not alert a viewer that the bolt conveys digital information.

6. A method to help determine whether an object is legitimate, comprising: using a handheld device equipped with an optical sensing capability to capture image data corresponding to a utilitarian object, said object having utility other than serving to convey or represent information; analyzing the captured image data to decode digital watermark information steganographically encoded therein; and using the decoded information in a determination of whether the object is legitimate; wherein said capturing includes capturing the image data from a pharmaceutical tablet.

7. The method of claim 6 in which the image data corresponds to a texture pattern with which the tablet was marked, wherein such marking does not alert a viewer that the tablet conveys digital information.

8. A method to help determine whether an object is legitimate, comprising: using a handheld device equipped with an optical sensing capability to capture image data corresponding to a utilitarian object, said object having utility other than serving to convey or represent information; analyzing the captured image data to decode digital watermark information steganographically encoded therein; and using the decoded information in a determination of whether the object is legitimate; wherein said capturing includes capturing the image data from packaging for a pharmaceutical product.

9. The method of claim 8 in which the image data corresponds to a texture pattern with which the packaging was marked, wherein such marking does not alert a viewer that the packaging conveys digital information.

10. A method to help determine whether an object is legitimate, comprising: using a handheld device equipped with an optical sensing capability to capture image data corresponding to a utilitarian object, said object having utility other than serving to convey or represent information; analyzing the captured image data to decode digital watermark information steganographically encoded therein; and using the decoded information in a determination of whether the object is legitimate; wherein said capturing includes capturing the image data from an automotive component.

11. The method of claim 10 in which the image data corresponds to a texture pattern with which the component was marked, wherein such marking does not alert a viewer that the component conveys digital information.

12. A method to help determine whether an object is legitimate, comprising: using a handheld device equipped with an optical sensing capability to capture image data corresponding to a utilitarian object, said object having utility other than serving to convey or represent information; analyzing the captured image data to decode digital watermark information steganographically encoded therein; and using the decoded information in a determination of whether the object is legitimate; the method further including comparing at least part of said decoded information with data that should correspond thereto and which is conveyed by the object, in a determination of whether the object is legitimate.

13. The method of claim 12 wherein the object is visibly marked with an indication of a purported property thereof, and the object property is also indicated by certain of said digital watermark information, and the method includes comparing said visibly marked indication with said property as indicated by said digital watermark information.

14. The method of claim 13 wherein said property is a speed property associated with said object.

15. A method comprising: decoding digital watermark information steganographically encoded in a set of data; identifying from said decoded information a portion thereof representing temporal information; comparing said identified temporal information with current temporal information; and permitting an action only if said current temporal information is before said identified temporal information.

16. A method comprising: decoding digital watermark information steganographically encoded in a set of data; identifying from said decoded information a portion thereof representing temporal information; comparing said identified temporal information with current temporal information; and taking an action based on a result of said comparison; wherein said set of data is optically sensed from a utilitarian object, said object having utility other than serving to convey or represent information.

17. A method comprising: decoding digital watermark information steganographically encoded in a set of data; identifying from said decoded information a portion thereof representing temporal information; comparing said identified temporal information with current temporal information; and refusing an action if said current temporal information is after said identified temporal information.